Improvement in bobim-tools



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@fab/wf l/ffo ai QA N. PETERS. FHOTO-LITHUGRAPHER, WASHINGTON D C nit-eh tetes @latent ffies.

Letters .Patent No.`8,0,515, dated July 28, 1868.

Non

IMPROVEMENT IN BORING-TOOLS.

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T0 ALL WHOM IT MAY CONCERN:

Be ir, known that I, AUGUS STEINBK, of New York, in the county andrState of New York, have invented Y a new and useful Improvement in Boring-Tools; and I do hereby declare the following to be a full, clear,\and

exact'desciiption thereof, which will enable those skilled -in the art to make and use the same, reference being hadto the accompanying drawing, forming part of this specicatien, in which drawing vFigure l represents a longitudinal central section of this invention.

Figure 2 is an elevation of the same.

Similar letters indicate corresponding parts. v v

`This invention consists in thearrangement of four or more gimlets and an auger in the interior of a square (or polygonaUease, said gimlets and auger being geared together, and the edges ofthe case being sharpened in such a manner that by impartingto the auger a revolving motion, the gimlets are also caused to revolve, and by the combined action ofthe auger, the girnlets, and the case, a square (or polygonal) hole can be bored with ease and facility. Y l

The inventionconsists also in-'the arrangement of an adjustable frame at the head of the case, said frame being made to foi-inthe bearing for the Shanks ofthe auger and of the gimlets, in such a manner that the points of theauger and of the gilulets can be set'in the proper relative position towards the cutting-edge of the case. i .Afrepresents a case, which is square or polygonal, according to the desired shape of the boleto be bored, and which is nlade'of sheet steel, either of a solid tube, or of a series of sections fastened together in any desirable manner. l The sides of the case are partially cut away, so that the shavings or boring's have room t'o escape, and the bottom end of the case is sharpened, as shown in the drawing.

To the headof the casc is secured a frame, B, composed'of two plates, which are secured by nuts a, and fustenedto the case by studs 6, rising from lugs c, which project from the sides ofjthe case.

`The frame B forms the lbearings for the Shanks 0l e of the auger D and-of the gimlets E. The auger extends down through the centre of the case, and the sides ot' the case are `in close proximity to the circum.

ference of the auger, while the gimlets occupy the corners ofthe case, as shown.` Y'.lhe Shanks of the auger 4and of the several gilnlets are geared together by pinions f, which are situated between the plates of the frame B, so that. by imparting a revolving motion to the auger, the gimlets are a-lso revolved.

By raising or lowering the frame B on the studs b, the points ofthe auger and ofthe gimlets can be brought in the proper relative position towards the cutting-edge of the case A. A. l y Iniorder to bore a hole, Iinsert the square end of the auger into a brace, and by pressing its point up against the wood and revolving the brace, the boring is effected. By the combined action of the auger-and of the gimlets, the `wood encompassed by the case is almost entirely removed, so that a. comparatively slight pressure on the end of the auger vis suiiicient to cause the cutting-edges of the case to clean out the corners, and to produce a smooth, squaro (or polygonal) hole at one operation.

I am aware that an auger hasbeen used in combination with a case enclosing the same, and I do not wish to claim this arrangement as my invention. l l

4Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

The adjustable frame B, in combination with the auger D, gimlets E E, and the ease A, provided with cutting-edges, constructed and operating substantially as described.

vAUGUST STEINIEK.

Witnesses:

W. HA'UFF, E. F.. Kasrusnunnn.

...HLA 

